I really hope it's not based on the Nex7 sensor, which is notoriously bad with M mount lenses. Fuji needs to improve their performance with wide angle lenses by reducing the sensor glass thickness. In any case, they will have to wait for Sony to come out with a new PDAF sensor (see Nex6 -X100s) or use the same X100s sensor. Not anytime soon.

That's down to the microlens design. It's completely possible to use the same base sensor with different microlenses (and a different CFA, as we've already seen). Having said that, despite Fuji releasing an official M mount adapter, the current X-Trans sensors don't have microlenses that handle UWA M mount lenses well either, and it suffers from the same problems as the NEX-7.

Exactly. Ricoh's M module for the GXR is perfectly designed to Leica M mount lenses, all the way to the corner. Fujifilm's X Trans sensor is distinctly substandard for wide angle use, according to Leica lens users.

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